Hello there! For this question, let’s plug in the values in order to get (12 * 12) + (5 * 6) + (3 * 3). When you multiply the values, you get 144 + 30 + 9. When you add those numbers up, you get 183. There. The answer to the expression is 183.
If you problem is as stated the answer is 414 because 12x+5y3z when substituted 12(12)+5(6)3(3) and 12(12)=144 5(6)=30 3(3)=9 then you problem would be 144+30(9). To solve 144+30(9) you must first solve 30(9), 30(9)=270, now you problem is 144+270=414
